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Financial Statement Components - Effects on net income (loss) of amounts reclassified from AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
Revenues | $ 1,509,453 |  |  | $ 1,119,898 |  |  | $ 2,922,867 | $ 2,213,158 |
Costs of revenues and operating expenses | 1,046,622 |  |  |  |  |  | 2,049,788 |  |
Interest expense | 40,472 |  |  | 26,538 |  |  | 80,822 | 52,900 |
Net income attributable to KLA | 380,555 |  | $ 346,525 | 369,100 |  | $ 395,944 | 727,080 | 765,044 |
Unrealized Gains (Losses) on Defined Benefit Plans |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
Other comprehensive (income) loss, reclassification adjustment from AOCI, pension and other postretirement benefit plans, net of tax | 200 |  |  | 200 |  |  | 500 | 400 |
Reclassification out of accumulated other comprehensive income | Unrealized gains (losses) on available-for-sale securities |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
Other expense (income), net | (82) |  |  | (469) |  |  | (86) | (950) |
Accounting Standards Update 2017-12 | Reclassification out of accumulated other comprehensive income | Unrealized gains (losses) on cash flow hedges from foreign exchange and interest rate contracts |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
Revenues | (8) | [1] |  | 1,705 | [1] |  | 365 | 2,688 | [1]
Costs of revenues and operating expenses | (17) | [1] |  | (158) | [1] |  | (1,818) | (292) | [1]
Interest expense | (100) | [1] |  | 189 | [1] |  | (199) | 377 | [1]
Net income attributable to KLA | $ (125) | [1] |  | $ 1,736 | [1] |  | $ (1,652) | $ 2,773 | [1]
[1] | Reflects the new accounting guidance for hedge accounting, which was adopted in the second quarter of fiscal year 2019. For additional details, refer to Note 16, “Derivative Instruments and Hedging Activities” of the Condensed Consolidated Financial Statements.

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